It's up to you to deduce the secret code within eight columns.

For each column, choose from one of six crystals for each of the four holders. Once you've made your choices, four quadrants will appear beneath the relevant column. Black quadrants mean you've placed the correct crystal in the correct holder; white quadrants mean that wile the crystal you've chosen is a part of the code, you've placed it in the crong holder.

Note, however, that the quadrants don't correspond to the order of the crystals - because where's the challenge in that?!

With this information, you should be able to deduce the secret code. (Which may or may not contain multiple crystals of the same color.)

ANd if you can't, there's always the Solve button - which will indeed reveal the code, but it'll also end your game!